Electric-dental-instrument holder.



No. 780,322. PATENTED JAN. 17, 1905.

M. N. GALLENDER. ELECTRIC DENTAL INSTRUMENT HOLDER.

APPLICATION FILED NOV. 3, 1904.

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E v fzhmlwlwlioz im lineman QM 4% I No. 780,322. Patented January 17,1905.

UNITED STATES PATENT OFFICE.

MONROE N. CALLENDER, OF SAN FRANCISCO, CALIFORNIA, ASSIC-NOR TO J.'l/V.ROOCH, OF SAN FRANCISCO, CALIFORNIA.

EL ECTRlC-DENTAL-lNSTRUMENT HOLDER.

SPECIFICATION forming part of Letters Patent No. 780,322, dated. January17, 1905.

Application filed November 3, 1904. Serial No. 231,307.

T (1/7/71 who? it 7/ con/OW": each case the current is supplied to thedental Be it known that I, MONROE N. CALLENDER, instrument by means ofwires 6, which pass 5 a citizen of the United States, residing at Santhrough an opening 7 in the front wall of the Francisco, in the countyof San Francisco and cabinet and are coiled around a drum 8, the 5 Stateof California, have invented certain new ends of the wires then beingconnected to two and useful Improvements in Electric-Dentalbinding-posts9, extending inwardly from the Instrument Holders, of which thefollowing flanged end 10 of the drum, said binding-post is aspecification. being connected through said end with con- This inventionrelates to improvements in centric collector-rings 11 on the end, whichIO electric dental-instrument holders, the object revolve in contactwith spring-contacts 12 13,

oftheinvention being to provide an apparatus supported upon one of theposts 14; which for supporting in a manner convenient to the support theshaft 15 of the drum. 6O operator dental instruments which utilize anWhen the operator takes down a dental 1nclectric current. strument andmoves the same from the switch- I5 In present forms of switchboards forelecboard, thereby drawing the cords through the trio dental instrumentsin which the instruaperture? and causing the drum to revolve, he mentsare supported upon the board the cords thereby winds up a spring 16,secured to the 5 for eachinstrumentmustbe ofsuflicientlength drum and tothe shaft 15, upon which it reto allow complete freedom of movement ofvolves, and upon releasing the cord the spring :0 the instrument whenbeing used by the oper- 16 rewinds the same upon thedrum, withdrawator,and these cords hang down when the ining it through theaperture 7, sothat when the strument is in position upon the switchboard, dentalinstrument is replaced in its proper 7 and therefore are inconvenientand present an spring-clip upon the switchboard the cord is untidyappearance. withdrawn behind the switchboard and wound 5 It is theobject of my invention to provide up out of sight. There is providedwith each a switchboard and holder which shall be free drum thepawl-latching device commonly used from this objection. onwindow-shades-- that is to say,upon the end In the accompanyingdrawings,Figurel is a of the drum are pivotally mounted a pair of front elevationof the apparatus. Fig. 2 is a pawls 17, one or the other of which isadapted 0 section thereof on the line 22 of Fig. 1, one to engageanotch18,:formed in the periphcryoif of the drums being shown in section. Fig.3 a circular support 19 forthe pawls secured to is a broken verticalsection of the apparatus the post 14. When the operator draws out the onthe line 3 3 of Fig. 2. cords, unwinding the same from the drum,Referring to the drawings, 1 represents a he will allow one of thesepawls to fall into 5 cabinet within which the apparatus isinclosed. thenotches, so that the drum is held station- This cabinet may form theupper portion of a ary while the instrument is being used, andlargercabinetcontaining-drawers and thelike, after use the operator willslightly pull the 5 the remainder of which, however, is omitted cords toWithdraw the pawl out of the notch, from the drawings as immaterial tothe presand thereby allow the spring to wind up the 0 cut invention.Upon the front wall or supdrum. Thetwo spring-contactsare connectedporting-board 2 of the cabinet are mounted to the source of electricity,one contact, 12, any desired number of spring-clips 3, each directlywith a wire 20 and the other contact. 9 I adapted to hold a dentalinstrument. In the 13, through the members of the spring-clip by presentinstance only two of such spring-clips a wire 21, leading to one of saidmembers, and

5 are shown; but as many more may be supby a wire 22, leading from theother member ported thereon as desired. The dental instruto a source ofelectricity. Thus when the ments shown in the present instance are andental instrument is withdrawn from the electric lamp a and a hot-airinjector 5. In spring-clip the circuit is closed through saidspring-clip; but when the instrument is inserted into the clip thecircuit is broken and no current is being used.

I claim- 1. In an apparatus of the character described, a board forholding a dental instrument, electric wires leading to the instrument, adrum around which the wires are wound, a spring for winding up saiddrum, a pawl for holding the drum against the spring, terminals on thedrum respectively connected with the ends of the wires, and connectionsfrom the terminals to a source of electricity, substantially asdescribed.

2. In an apparatus of the character described, a switchboard havingthereon means for holding a dental instrument, electric wires leading tothe instrument, a drum around which the wires are wound, a spring forwinding up said drum, a pawl for holding the drum against the spring,terminals on the drum respectively connected with the ends of the wires,connections from the terminals to a source of electricity, and a switchon the board in the circuit so formed, substantially as described.

3. In an apparatus of the character described, a board having thereon aspring-clip for holding a dental instrument, electric wires leadingthrough the board to the instrument, a drum behind the board aroundwhich the wires are wound, a spring for winding up said drum,a pawl forholding the drum against the spring, terminals on the drum respectivelyconnected with the ends of the wires, and connections from the terminalsto a source of electricity, substantially as described.

In witness whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

M. N. CALLENDER. IVitnesses:

FRANoIs M. WVRIGHT, BEssIE GORFINKEL.

